# uncompyle6 version 3.2.3
# Python bytecode 3.6 (3379)
# Decompiled from: Python 3.6.8 |Anaconda custom (64-bit)| (default, Feb 21 2019, 18:30:04) [MSC v.1916 64 bit (AMD64)]
# Embedded file name: distutils\versionpredicate.py
"""Module for parsing and testing package version predicate strings.
"""
import re, distutils.version, operator

re_validPackage = re.compile("(?i)^\\s*([a-z_]\\w*(?:\\.[a-z_]\\w*)*)(.*)", re.ASCII)
re_paren = re.compile("^\\s*\\((.*)\\)\\s*$")
re_splitComparison = re.compile("^\\s*(<=|>=|<|>|!=|==)\\s*([^\\s,]+)\\s*$")


def splitUp(pred):
    """Parse a single version comparison.
    
    Return (comparison string, StrictVersion)
    """
    res = re_splitComparison.match(pred)
    if not res:
        raise ValueError("bad package restriction syntax: %r" % pred)
    comp, verStr = res.groups()
    return (comp, distutils.version.StrictVersion(verStr))


compmap = {
    "<": operator.lt,
    "<=": operator.le,
    "==": operator.eq,
    ">": operator.gt,
    ">=": operator.ge,
    "!=": operator.ne,
}


class VersionPredicate:
    """Parse and test package version predicates.
    
    >>> v = VersionPredicate('pyepat.abc (>1.0, <3333.3a1, !=1555.1b3)')
    
    The `name` attribute provides the full dotted name that is given::
    
    >>> v.name
    'pyepat.abc'
    
    The str() of a `VersionPredicate` provides a normalized
    human-readable version of the expression::
    
    >>> print(v)
    pyepat.abc (> 1.0, < 3333.3a1, != 1555.1b3)
    
    The `satisfied_by()` method can be used to determine with a given
    version number is included in the set described by the version
    restrictions::
    
    >>> v.satisfied_by('1.1')
    True
    >>> v.satisfied_by('1.4')
    True
    >>> v.satisfied_by('1.0')
    False
    >>> v.satisfied_by('4444.4')
    False
    >>> v.satisfied_by('1555.1b3')
    False
    
    `VersionPredicate` is flexible in accepting extra whitespace::
    
    >>> v = VersionPredicate(' pat( ==  0.1  )  ')
    >>> v.name
    'pat'
    >>> v.satisfied_by('0.1')
    True
    >>> v.satisfied_by('0.2')
    False
    
    If any version numbers passed in do not conform to the
    restrictions of `StrictVersion`, a `ValueError` is raised::
    
    >>> v = VersionPredicate('p1.p2.p3.p4(>=1.0, <=1.3a1, !=1.2zb3)')
    Traceback (most recent call last):
      ...
    ValueError: invalid version number '1.2zb3'
    
    It the module or package name given does not conform to what's
    allowed as a legal module or package name, `ValueError` is
    raised::
    
    >>> v = VersionPredicate('foo-bar')
    Traceback (most recent call last):
      ...
    ValueError: expected parenthesized list: '-bar'
    
    >>> v = VersionPredicate('foo bar (12.21)')
    Traceback (most recent call last):
      ...
    ValueError: expected parenthesized list: 'bar (12.21)'
    
    """

    def __init__(self, versionPredicateStr):
        """Parse a version predicate string.
        """
        versionPredicateStr = versionPredicateStr.strip()
        if not versionPredicateStr:
            raise ValueError("empty package restriction")
        match = re_validPackage.match(versionPredicateStr)
        if not match:
            raise ValueError("bad package name in %r" % versionPredicateStr)
        self.name, paren = match.groups()
        paren = paren.strip()
        if paren:
            match = re_paren.match(paren)
            if not match:
                raise ValueError("expected parenthesized list: %r" % paren)
            str = match.groups()[0]
            self.pred = [splitUp(aPred) for aPred in str.split(",")]
            if not self.pred:
                raise ValueError("empty parenthesized list in %r" % versionPredicateStr)
            else:
                self.pred = []

    def __str__(self):
        if self.pred:
            seq = [cond + " " + str(ver) for cond, ver in self.pred]
            return self.name + " (" + (", ").join(seq) + ")"
        else:
            return self.name

    def satisfied_by(self, version):
        """True if version is compatible with all the predicates in self.
        The parameter version must be acceptable to the StrictVersion
        constructor.  It may be either a string or StrictVersion.
        """
        for cond, ver in self.pred:
            if not compmap[cond](version, ver):
                return False

        return True


_provision_rx = None


def split_provision(value):
    """Return the name and optional version number of a provision.
    
    The version number, if given, will be returned as a `StrictVersion`
    instance, otherwise it will be `None`.
    
    >>> split_provision('mypkg')
    ('mypkg', None)
    >>> split_provision(' mypkg( 1.2 ) ')
    ('mypkg', StrictVersion ('1.2'))
    """
    global _provision_rx
    if _provision_rx is None:
        _provision_rx = re.compile(
            "([a-zA-Z_]\\w*(?:\\.[a-zA-Z_]\\w*)*)(?:\\s*\\(\\s*([^)\\s]+)\\s*\\))?$",
            re.ASCII,
        )
    value = value.strip()
    m = _provision_rx.match(value)
    if not m:
        raise ValueError("illegal provides specification: %r" % value)
    ver = m.group(2) or None
    if ver:
        ver = distutils.version.StrictVersion(ver)
    return (m.group(1), ver)
